feat(bar): 实现 bar 可见性切换 action

src/core/command.h

@@ -22,6 +22,7 @@ typedef enum command_type_t {
   ZDWM_COMMAND_SET_CURRENT_OUTPUT,
   ZDWM_COMMAND_SET_LAYOUT,
   ZDWM_COMMAND_SET_BINDING_MODE,
+  ZDWM_COMMAND_SET_BAR_VISIBILITY,
   ZDWM_COMMAND_QUIT,
 } command_type_t;
 
@@ -64,6 +65,10 @@ typedef struct set_binding_mode_command_t {
   zdwm_binding_mode_id_t mode;
 } set_binding_mode_command_t;
 
+typedef struct visibility_command_t {
+  bool visible;
+} visibility_command_t;
+
 typedef struct quit_command_t {
   bool will_restart;
 } quit_command_t;
@@ -98,6 +103,7 @@ typedef struct command_t {
     set_current_output_command_t current_output;
     set_layout_command_t layout;
     set_binding_mode_command_t binding_mode;
+    visibility_command_t bar_visibility;
     quit_command_t quit;
   } as;
 } command_t;